Air-purifying and ventilating device.



w. 0. now. I AIR PURIFYING AND VENTILATING DEVICE.

1 D APPL-lCAT l0I-4 FILED JULY 11.1916. Patentedjuly 10, 1917. V I 2 sumsfsugn 1.

"almana-ZW, mnaaniaimmaaaszmnmam W. D. DOTY. AIR P-URIFYING'AND-'VENTILATING DEVICE.

APPLICATION FILED lULY 11. I916.

Patepted July 10, 1917.

2 SHEETS-SHEET 2- I WILLIAM D. DOTY 0F STREATOR, ILLINOIS.

AIR-PURIFYING AND VENTILATING DEVICE.

Specification of Letters Patent.

Patented July 10, 1917.

Application filed July 11, 1916. Serial No. 108,647.

To all whom it may concern Be it known that I, WILLIAM D. DoTY, a citizen of the United States, residing at Streator, in the county of Ila Salle and State of Illinois, have invented certain new and useful Improvements in Air-Purifying and VentilatingDevices, of which the followlng is a specification.

This invention relates to air purifying and ventilating devices and more particularly a screen designed for arrangement in a window or the like and the invention is designed more particularly as an improvement upon the structure shown in my copending application filed Jan. 8, 1916, Serial N 0. 71,040. In the structure shown in the said copending application the foraminous sheets of the screen are secured in place by engaging their edges with spurs which are carried by the members of the slidably connected frames which comprise the body of the screen but this arrangement has not proven entirelysatisfactory inasmuch as the spurs penetrate the material of the said foraminous sheets and, furthermore, are.

liable to cause injury to ones hands in opening and closing and otherwise manipulating the screen. Therefore, the present in vention aims. to provide a novel means for securing the foralnino-us sheets in their respective frames in such manner that they may be readily removed and replaced and will not be liable to become torn or frayed at their edges and also in such manner that nosharp spurs or projections will be presented' inposition liable'to cause injury to ones hands inmani-pulating the screen. In the accompanying drawings Figure 1 is a perspective view of the screen embodying the present invention;

Fig. 2 is a. view, in elevation thereof, parts being broken away and parts being shown in section, and the said screen being closed;-

Fig. 3 is'a view looking at the upper edge of the said screen;

Fig. 4 is a horizontal sectional view therethrough,

Fig. 5 1s a vertical transverse sectional view; 1

Fig. 6 1s a detall horizontal sectlonal view through the adjacent endsof the frames comprising the screen;

Fig. 7 is a perspective view of one corner of one of the frames, the frame members being separatedf Fig. 8 is a group perspective view illustrating one end of one of the frames, one end of the foraminous sheet which is to be arranged therein, and a portion of theflexible binding element for securingthe said sheet in place.

The screen consists essentially ,of two bers, which are indicated by the numeral 3,

the outer vertical edge of each of the end members being overturned upon the said member, as indicated by the numeral 4, so as to reinforce the said member. The opposite or inner vertical edge portion of each of the end members 3 is turned in, as at 5, to form a flange which lies in spaced relation to the face of the said end member and between the said flange and the said member there is in this manner provided a channel 6 for a purpose to be presently explained. Also for a purpose to be presently set forth the edge portion of the flange is bent inwardly upon itself, as indicated by the nu meral 7, so that the channel 6 is in effect slightly contracted at its open side.-

2 of each frame and the upper and lower ends of the end members 3 thereof are overlapped, as clearly shown in the drawings,

The ends of the upper and lower members 1 and and secured together by welding, or in any other suitable manner. The inner longitudinal edge portion of each of the members 1 and 2 of each frame is bent over as indicated by the numeral 8 so as to forma channel 9 corresponding to the channel 6 and the edge portion of the flange 8'is turned inwardly upon the said flange, as indicated by the numeral 10 so that the channels 9 also are slightly contracted or restricted at their open sides.- It will be observed by reference to the drawings that the ends of the channels 6 and 9 communicate with each other and therefore each of the frames is provided at one side with a, continuous channel which is of rectangular extent, or.

in other words, extends parallel to the-:mar-

gin of the frame and is spacedin'wardly therefrom. A foraminous'sh'eetlfof material, such for example as cloth, indicated by'the numeral 11, is removably arranged within each of the frames and in securing the said sheetsin place the marginal por tions thereof are laidwithin the channels 6 and 9 of the respective frame and a suitable length of cord or like flexible and yieldable material is stretched within the channels edges 7 and 10, as clearly shown in Figs. 4t

length of the respective channel.

and extends continuously throughout Tthe he flexible binding element 12 serves to bind the marginal portion of the foraminous sheet which it is to secure in place, within the channels 6 and 9, and forthis purpose the cord is preferably of a diameter slightly greater than the width ofthe channel so that when forced into the channel it will be securely frictionally held therein not only by reason of its frictional engagement with the marginal portions ofthe sheet and with the walls of'the channels, but also by reason of its engagement against the overturned and 5 of the drawings. In order to prevent insects frompassing between the frames comprising the screen, the outer vertical edge port on of the end member of, one

' screen is turned inwardly at right angles to form a guard flange, indicated by the numeral 13, the edge of which flange-lies relatively close to the foraminous'sheet which is mounted in the other one of the said frames,

' and in order to slidably connect the frames,

upon itself whereby the channel will be re I stricted at the open side thereof, a. foraminous sheet of material arranged within the frame and having its marginal portions laid within the channel, and a' yieldable flexible'element also laid within the channel and engaged by the edges of the overturned portions of the said flanges.

2.- In a device, of the; class described, a

frame havin its component.members provided with anges at one side forming a channel extending around the opening defined by the said members, the free edge portion of .each flange being bent upon itself inwardly with the edg the bent in P tion'spaced from the bottom of the channelv formed by the respective flange whereby the i channel will be restricted at its open side and also, whereby a shoulder will be provided within the channel extending longitudinally thereof, a flexible foraminous sheet of material arranged within the frameand having its marginal portions laid within the channel, and a yieldable flexible element also laid within the channel and confining the marginal portions of the said sheet of ma-' terial within the bottoms of the channels and against the said edges of the inturned portions of the flange's.

In a device of the class described, a

frame consisting of plates having their ends secured together; and defining a central opening, the outer edges of the plates being doubled on themselves and theinner edges thereof being doubled on themselves in the opposite direction whereby a channel will be provided on one side of the framearound the central opening therein, the free ex-j tremities of said inner doubled edges being beaded whereby to contract the mouth of the channel, a sheetv of foraminous material having its edges within said channel, and a flexible binding element laid within the channel against the edges of said sheet.

In testimony whereof I afiix my signature.-

WILLIAM 1 DOTY. 1,. s.]' 

